INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
AMT credit reclassification amount	$ 500
Cash paid for income taxes	213	$ 357	$ 55
Tax act, one time tax expense	5,900
Tax act, transition tax, income tax expense	38
Tax act, existing undistributed accumulated earnings of foreign subsidiary	20
Tax act, foreign earnings, provisional liability	50	$ 0
Tax Years 2018 Through 2022
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	88,000
Tax Years 2024 Through 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,500
Tax Year 2027 and later
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	500
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	94,000
Domestic Tax Authority | Research Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 400